Strip-folder for sewing-machines



I A. H. DE VOE. STRIP FOLDER FOR sEwmamAcmmzsb APPLICATION FILED SEPT.11, 1919.

1,400,530,- Patented Dem-20, 1921.

INVENTOR WITN SES:

UNITED STATES PATENT OFFICE.

ALBERT H. DE VOE, OF WESTFIELD, NEW JERSEY, ASSIGNOR TO THE SINGER MANU-FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

STRIE-FOLIDER FOR SEWING-MACHINES.

Specification of Letters Patent. Patented Dec. 20, 1921.

Application filed September 11, 1919. Serial No. 323,162.

To all whom it may concern.

Be it known that I, .ALBERT H. DE Von, a citizen. of the United States,residing at V festfield, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Strip-Folders forSewing-Machines, of which the following is a specification, referencebeing had therein to the accompanying drawings.

This invention relates to strip-folders for sewing machines and has foran object to provide a unitary structure, extending in the direction ofthe feed of the fabric, capable of successively folding a strip offabric a plurality of times and to properly control the strip beti 'eenthe folding operations.

A further object of the invention is to provide a folder adapted tofirst fold a strip of fabric substantially centrally thereof to form adouble strip, and later fold over the marginal portion consisting of thetwo raw edges, and still later fold the other marginal portion over anddown upon the previously folded marginal portion thereby overlapping themarginal portions and covering the raw-edges of the strip.

According to the present invention the folder is constructed with threeindependently acting folding portions viz., a primary body foldingportion, and secondary and tertiary margin folding portions, thedelivery end of the primary folding portion merging into and forming thereceiving end of the two margin-folding portions.

The invention is illustrated in the accompanying drawings in whichFigure 1 is a perspective view of the folder as attached to theclotlnplate of a sewing machine. Fig. 2 is a plan view of the sameshowing a strip of fabric inserted therein. Figs. 3, 4 and 5 areenlarged transverse sectional views on the lines 3-3, 4-4 and 55,respectively, of Fig. 2 and Fig. 6 is a perspective view of a strip offabric folded by an attachment embodying the present invention.

Referring more particularly to the drawings, the folder is constructedwith a shank 1, adapted to be secured to the cloth-plate 2 of a sewingmachine, and has a primary folding portion or scroll 3 adapted toreceive the fabric 8 with a face thereof extending in substantiallyvertical plane and to fold the fabric centrally thereof to form thedoubled strip 0? extending in a substantially horizontal plane. Thisprimary; folding por 7 and turns the right marginal portion r of thedoubled strip (Z overupon the central portion 0. The scroll 7 which hasits delivcry end overlapping the delivery end of the scroll 6 folds theleft marginal portion Z over upon the portion 7' thereby covering theraw edges ee of the strip 8.

The folder is formed intermediate the scrolls 6 and 7 with a tensionspring 8 adapted to bear against the strip and slightly tension thesame. a

The spring Sis provided with an aperture 9 to facilitate threading ofthe strip through the folder. g

' The stripis drawn through the folder by theaction of the feedingelement 10 acting in conjunction with the presser-foot l1, and isstitched by suitable stitching mechanism of which the needles 12 onlyare shown. 7

It will be observed that the strip .9 is passed through a single foldercomprising plurality of folding portions and that by merging thedelivery end of the primary strip-folding portion into the receiving endof the edge-folding portions the strip is under constant control duringits entire passage through the folder.

It is obvious that various changes may be made in the construction,proportions, sizes, (520., of the different parts of the folder, andthat provision may be readily made for turning in both edges of thedoubled strip more or less than is illustrated in the draw ings or onlyone of the overlying marginal portions without departing from the spiritof the invention. Y

Having thus set forth the nature of the in vention, what I claim hereinis- 1. In a strip folder, in combination, means for doubling a stripsubstantially centrally thereof, and independently acting means forfolding the marginal portions of the doubled strip.

2. A strip-folder including a folding portion adapted to double a strippassed there through. and an independently acting folding portionadapted to fold one marginal portion of the doubled strip, sald foldingportions being so constructed and arranged that the delivery end of thefirst-named folding portion merges into and forms the receiving end ofthe last-named folding portion. r V

8. A strip-folder comprising a primary folding portion adapted to doublea strip passed therethrough, and independently and l. A strip-foldercomprising a unitary structure extending in a single direction andhaving a folding portion adapted to. double a strip passed therethrough,and independently acting folding scrolls for turning in the marginalportions of the doubled strip.

5 A strip-folder comprising a primary folding portion adapted to doublea strip substantially centrally thereof, and secondary and tertiaryfolding portions, forming continuations of the primary folding portion,each adapted to fold over one of the marginal portions of the doubledstrip,lsaid folding portions being so constructed and arranged as tosuccessively double the strip,- to fold over the marginal portion of thedoubled strip comprising the tWoraW edges and to fold overtheinarginalportioncomprisingthe folded edge, the delivery end of thetertiary'folding portion overlappingthe delivery end of. the secondaryfoldingportion whereby the marginal portions of the strip are foldedinto overlapping relationship with the edges concealed.

6. A strip-folder comprlsing'a prlmary "strip-folding portion adapted todouble a strip passed therethrougln'a plurality of'independently actingfolding portions adapted to receive the doubled strip from the primaryfolding portion and fold the margins thereof, and a'strip-tensioningspring lo cated intermediate the margin-folding portions.

7. A strip-folder comprising a primary folding portion'adapted to fold astrip in one direction, a secondary foldingportion adapted to fold. onemargin of the folded strip in'a direction opposite to the primaryfolding portion and a tertiary folding portionadapted to fold the othermargin of the folded strip in a direction corresponding to the directionof the primary folding portion.

In a strip-folder, in combination, means for doubling strip, andindepend-' ently acting means for folding the marginal portions of thedoubled strip into overlap" ping relationship.

9. A strip-folder comprising a portion] adapted to receive a strip ledthereto substantially in a vertical plane, means for folding the stripsubstantially centrally thereof and means for delivering the foldedstrip horizontally to independently acting folding scrolls adapted tofold the marginal portions of the folded strip in opposite directionsinto overlapping relationship In testimony whereof, I have signed myname to this specification.

ALBERT DE Von.

